Improvement in pendulums



0. W. WADE & D. G. WHITE.

Pendulums.

No. 218,344. Patented Aug. 5,1879.

Wdtnesea WASHINGTON D C UNITED STATES PATENT OFFICE.

ORON \V. XVADE AND DAVID G. WHITE, OF OSKALOOSA, IOXVA.

IMPROVEMENT IN PENDULUMS.

Specification forming part of Letters Patent NO. 218,344, dated August5, 1879 application filed April 5, 1879.

To all whom it may concern:

Be it known that we, OR-ON XV. WADE and DAVID G. WHITE, both ofOskaloosa, in the county of Mahaska and State of Iowa, have inventedcertain new and useful Improvements in Pendulums; and we do herebydeclare that the following is afull, clear, and exact description of theinvention, which will enable others skilled in the art to which itappertains to make and use the same. reference being had to theaccompanying drawings, which form a part of this specification, and inwhich- Figure 1 is a front elevation. Fig. 2 is a side view, and Fig. 8is a cross-section, taken on the line indicated by :1; a in Fig. 1.

Similar letters of reference indicate corre sponding parts in all thefigures.

Our invention relates to compensation-pendulums, or that class ofpendulums which are provided with isochronous means of adjustment tocompensate the effects of heat and cold; and it consists in thecombination, with the pendulum, of a vertical supporting-rod, made ofthe same metal as the peiululum-rod, and provided with means ofadjustment, substantially in the manner and the purpose hereinafter morefully described.

In the drawings, A represents the standard or support, which may be theframe-work of a clock or form a part thereof. Secured vertically uponframe A are two parallel guidepieces, a a, united by cross-pieces Z) bat the top and bottom, their inner sides being beveled so as to form avertical dovetailed slot or recess, 0, upon frame A. Into this recessare inserted two blocks, 0 D, secured in the lower one of which, D, is arod, B, the upper end of which is inserted through a keeper or staple,d, in the upper cross-piece, I), and bent outward to form a projectingarm, 13. The upper sliding block, 0, is also provided with a pro jectingarm, 0, bent or shaped so as to form a narrow slit or slot, f,vertically below a corresponding slit in the arm B of rod B.

The blocks 0 D are both vertically adjustable by means of set-screws gh; and it follows that, by turning the screw it, rod B may be raised orlowered, While, by turning the upper screw, g, block 0 may be similarlyadjusted.

The upper part of rod B may be flattened to correspond to the flattenedpart of the pendulum-rod E, which is suspended from the arm B andinserted through the slit f in arm 0.

From the foregoing description, taken in connection with the drawings,the operation of our invention will be readily understood.

The pendulum may be raised or lowered to adjust the radius of its strokeor the number of its vibrations by adjusting either of the set-screws lbor g, according to which one of the two is most convenient for use.

The relative position of rods 13 and E will always remain the same, andthese being of equal length and thickness, and made of the same metal,it is obvious that their expansion and contraction will be alike, but inopposite direct-ions, so that the expansion or contraction of thesuspension-rod B will compensate for that of the pendulunrrod F.

Having thus described our invention, we claim and desire to secure byLetters Patent oi" the United States- 1. The combination of the"ertically-adjustable block D and rod B, having bent arm 3, adjustableblock (1, having slotted arm or bracket 0, and pendulum-rod E,substantially as and for the purpose herein shown and specified.

2. In combination the support or frame A, having parallel guide-pieces(t (t and crosspieces Z) 7;, provided, respectively, with the set-screwsh 9, adjustable block or slide 0, having projecting arm or keeper 0,adjustable block D, supporting the suspension-rod B, and pendulum E, allconstructed and combined to operate substantially as and for the purposeherein shown and described.

In testimony that we claim the foregoing as our own we have hereuntoat'fixed our signatures in presence of two witnesses.

()RON IV. XVADE. DAVID G. WVHITE. lVitnesses JOHN SHANE, R0131. KIssIoK.

